A study of coating mechanical and optical losses in view of reducing mirror thermal noise in gravitational wave detectors

R. Flaminio 1 J. Franc 1 Christine Michel 1 N. Morgado 1 L. Pinard 1 B. Sassolas 1
1 LMA - Laboratoire des matériaux avancés
Abstract : Mirror coatings play a crucial role in the performance of laser interferometers devoted to gravitational wave detection such as Virgo and LIGO. Mechanical losses in the coating material limit the sensitivity of the detectors due to the associated mirror thermal noise. The absorption of light in the coating induces a thermal lens in the mirror substrate which reduces the quality of the optical interference and requires sophisticated thermal compensation systems. This paper describes the work ongoing at LMA in order to reduce mechanical losses and optical absorption in the coating. The results obtained by doping Ta2O5 layers and testing different high-index materials are described. Finally the performances of different potential coatings are compared and the results obtained with a 40 kg mirror are reported. Titania doped Ta2O5 shows mechanical losses of 2 × 10−4 and absorption below 0.5 ppm. Nb2O5 appears to be the best competitor from the thermal noise point of view but it has an optical absorption four to five times larger.
Type de document :
Communication dans un congrès
The 8th Edoardo Amaldi Conference on Gravitational Waves (Amaldi 8), Jun 2009, New-York, 27, pp.0840030, 2010, 〈10.1088/0264-9381/27/8/084030〉
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http://hal.in2p3.fr/in2p3-00567980
Contributeur : Dominique Girod <>
Soumis le : mardi 22 février 2011 - 13:48:41
Dernière modification le : jeudi 8 février 2018 - 11:08:10

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IN2P3 | LMA | UNIV-LYON1

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R. Flaminio, J. Franc, Christine Michel, N. Morgado, L. Pinard, et al.. A study of coating mechanical and optical losses in view of reducing mirror thermal noise in gravitational wave detectors. The 8th Edoardo Amaldi Conference on Gravitational Waves (Amaldi 8), Jun 2009, New-York, 27, pp.0840030, 2010, 〈10.1088/0264-9381/27/8/084030〉. 〈in2p3-00567980〉

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